用适当的介词填空.Weshouldwashourhands()meals.IoftenaskMrZhang()somescienceproblems.
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题目内容:
用适当的介词填空.
We should wash our hands ( ) meals.
I often ask Mr Zhang ( ) some science problems.
优质解答
before:在吃饭之前;
about:关于一些科学问题
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